Motor vehicle muffler



July 28, l959 M. H. KuRAs y -2,896,739

uoToR VEHICLE MUFFLER Filed Aug. 12, 1957 zo y gfo @d 2 1 United States Patent O MOTOR VEHICLE MUFFLER Manfred H. Kuras, Hamilton, Ontario, Canada Application August 12, 1957, Serial No. 677,706

3 Claims. (Cl. 181-46) This invention relates to automotive vehicles and more particularly to a muier for the exhaust system thereof.

It is an object of the present invention to provide a novel muffler assembly for the exhaust pipe of an automotive vehicle which will eiectively reduce the volume of noise ordinarily emanating therefrom in a simple and eilicient manner.

Another object of the present invention is to provide a muffler having a plurality of groups of different size exhaust pipes so proportioned that the decibel rating of each group will diier with the other groups and the resulting varying wave lengths of the sound waves will neutralize each other so as to diminish such noise.

Other objects of the invention are to provide a muiller bearing the above objects in mind which is of simple construction, has a minimum number of parts, is inexpensive to manufacture and eilicient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following de tailed description taken in conjunction with the accompanying drawing, in which:

Figure 1 is a top plan View of a muiiler made in accordance with the present invention;

Figure 2 is an end elevational view of the device shown in Figure 1; and

Figure 3 is a diagrammatic top plan view of the mufiler shown in Figures l and 2 in operative use.

Referring now more in detail to the drawing, a mufer made in accordance with the present invention is shown to include an L-shaped exhaust pipe having a reia" tively short base leg 12 that has an attachment ange 13 adjacent the free end thereof. 'This flange 13 is adapted to be integrally connected to the mating flange 15 carried by the exhaust pipe 16 of the automotive vehicle. This L-shaped exhaust pipe is also provided with an elongated leg 18 which is closed at the outer end by means of a closure member 14 and which is provided with a plurality of groups of exhaust pipes 19, 20, 21 of dilerent sizes. The longitudinal axes of all of these pipes lie in substantially a common plane which also contains the longitudinal axis of the elongated leg 18 of the L-shaped 5 pipe. The central group of exhaust pipes 19 is of the 2,896,739, Patented July as, 1959 largest diameter, while a slightly smaller group of pipes 20 are disposed at one side thereof and a still smaller group of pipes 21 disposed at `the opposite side thereof.

The diameters of the various groups of pipes are chosen so that the decibel rating of each group will differ and the varying wave lengths emanating therefrom will neutralize each other and thus diminish the sound of the exhaust gases. For example, satisfactory results are obtained when the relationship between the respective groups of pipes 20, 19, 21 is in the order of 3 to 5 to 4, or inch, 5A; inch, or 4@ inch, respectively. However, any other suitable sizes may be chosen so long as the relationship between the respective pipes is substantially of this order.

As is shown in Figure 3, the discharge ends of the pipes 19, 20, 2.1 are faced rearwardly toward the rear end of the vehicle y25 and the entire muiiler may be supported upon the chassis 23 of the vehicle in a conventional manner along with the main exhaust pipe 16. Since the combined cross sectional area of all of the discharge pipes 19, 20, 21 is greater than the cross sectional area of the conduit 18, there is little or no back pressure in the system.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as dened by the appended claims.

What IV claim as new and desire to protect by Letters Patent of the United States is:

1. A mufer for attachment to the exhaust pipe of an internal combustion engine of an automotive vehicle comprising, in combination, an L-shaped conduit having a base leg and an angularly related leg closed at its outer end, and a plurality of substantially horizontally outwardly extending fully open discharge pipes of diverse sizes associated with said angularly related leg, said discharge pipes being divided into a plurality of groups of pipes of different cross sectional area, all of the pipes in each group being of -the same cross sectional area.

2. The combination according to claim 1, wherein the group of pipes of largest cross sectional area is disposed adjacent to the mid portion of said angularly related leg, and the other of said groups are arranged at each side of said largest pipes.

3. The combination according to claim 2, wherein the cross sectional area of all of said pipes is greater than the cross sectional area of said vertical leg.

References Cited in the file of this patent UNITED STATES PATENTS 1,077,905 Dewey Nov. 4, 1913 FOREIGN PATENTS i 6,204 Austria Dec. 27, 1901 121,212 Great Britain Jan. 12, 1918 477,245 Great Britain Dec. 24. 1937 

